Recessing means



March 10, 1953 w; B. RETZ RECESSING MEANS Filed Jan/24, 1949 5 Sheets-Sheet l INVENTOR W/LL/AMB. R572 TTO NEYS March 10, 1953 w. B. RETZ 2,530,621

RECESSING MEANS Filed Jan. 24, 1949 5 Sheets-Sheet 2 MT HM ll//// J W41 !IlII//// INVENTOR W/LL/AM 5. R572 ATTO R N EYS March 10, 1953 w. a. RETZ 2,630,621

RECESSING MEANS File d Jan. 24, 1949 5 Sheets-Sheet s INVEN'I OR W/LL/AM 5. R572 ATTORNEYS Mara; 10, 1953 w. B. RETZ RECESSING MEANS Filed Jan. 24', 1949 5 Sheets-Sheet 5 l l f 2 INVENTOR MAL/AM 5. R572 BY I ATTORNEYS Patented Mar. 10, 1953 UNITED STATES PATENT OFFICE RECESSING MEANS William B. Retz, Plainville, Conn., assignor to The New Britain Machine Company, New Britain, Conn, a corporation of Connecticut Application January 24, 1949, Serial No. 72,418

16 Claims. 1

My invention relates to a machine tool, and in particular to means for producing a novel movement having utility in the generation of a recess in a machine operation.

It is an object of the invention to provide an improved device of the character indicated.

It is another object to provide improved recessing means for a turret-type lathe.

Another object is to provide means for incrementally indexing a turret in order to perform a cutting operation.

It is also an object to provide recessing means for an indexible lathe-type machine, the said recessing means being effective at one of a plurality of indexible working stations.

It is still another object to provide improved locking means for the indexible means of a machine of the character indicated, the locking means being effective in accordance with different selected locking programs for different indexed positions of said indexible means.

It isa more specific object to provide a machine of the character indicated in which recessing and forming operations may be simultaneously carried out on the same piece of work.

It is still another specific object to provide an improved means of the character indicated, wherein recessing and cut-off operations may be performed concurrently.

Other objects and various further features of the invention will be pointed out or will occur to those skilled in the art from a reading of the following specification in conjunction with the accompanying drawings. In said drawings, which show, for illustrative purposes only, a preferred formof the invention:

Fig. 1 is a partly sectionalized and partly broken-away front elevation of a machine incorporating features of the invention;

Fig. 2 is a fragmentary sectional view of parts of the machine of Fig. 1, taken more or less in the plane 2-2 of Fig. 1;

Fig. 3 is an enlarged perspective view of certain parts of the mechanism of Fig. 1;

Fig. 4 is a simplified schematic representation of parts of the machine of Fig. 1;

' Fig. 5 is a layout of program means for the machine of Fig. 1;

Fig. 6 is a simplified schematic showing of a modified construction according to the invention;

Fig. 7 is a layout of program means for the arrangement of Fig. 6; and

Fig. 8 represents a modified cam for substituted use with the program means of Fig. 5.

Although my invention is described in application to a novel recessing means, the invention broadly contemplates the introduction of a novel relative movement in a machine having a work holder, a tool holder, and indexible means for one of said holders. The novel movement consists of the application of an incremental indating motion to the indexible means when the indexible means is at the indexed position in which said holders are to cooperate. In the form to be described, the machine is a turret lathe including crossor forming-slide means and an indexible turret. The forming-slide means and the turret may effectively engage one another off the turret-index axis for one indexed .position of the turret; and, when so engaged, a feed of the cross-slide means may impart an angular feeding movement to the turret. If a recessing operation is to be performed at the station in which the incremental indexing takes place, then the normal feed of the turret may bring the recessing tool into a position within the work, and the cross-slide means may advance the tool to cut a recess; the cross-slide may thereafter withdraw the tool from the recess, before the turret-feed means is effective longitudinally to withdraw the tool from within the work. Also in the form to be described, novel locking means may be employed for the turret, in order to assure proper engagement of the turret or turret-borne tool holder with the cross-slide means during a feeding movement of the turret at the recessing station; the locking means may then effectively release the turret for angular or indexing freedom during the feed cycle of the cross-slide means. If desired, the locking means may again take over to locate the turret after completion of the feed cycle of the cross-slide means and during longitudinal withdrawal of the turret and, hence, of the recessing tool from the work.

Referring to Figs. 1 to 5 of the drawings, my invention is shown in application to a lathetype machine having a single spindle ID for continuous rotation of a piece of work H. Collet means l2 may support the work II, and, in the form shown, the collet I2 is hollow in order to accommodate the internal feeding of tubular stock I]. The machine may include a plurality of forming or cross slides, such as the slide I3 for a forming tool M, the slide l5 for another forming tool or for an end-facing tool IS, the slide I! (cut-off tool slide) for a cut-ofi tool l8, and the slide l9 (recess cross slide) for a purpose which will later be clear. All slides constituting the forming-slide means may have a common drive, which will be termed the forming-slide camshaft 26, and a plurality of idler gears 2|22 may serve to couple the drive pinions of the program shafts 262324 for the various forming slides. In the form shown, each cross slide isdriven through bellcrank cam-follower means cooperating with cam means on one of the shafts 2|J-2324, and, in the case of the forming slide I9, the cam-follower arm 25 rides a cam 26 on the shaft 24. The cam follower 25 may include an arm 2'! for feeding engagement with the cross slide |9, as will be clear.

The machine may further include a longitudinally displaceable turret 28 supported for longitudinal sliding motion on an arbor or stem 29. The longitudinal sliding motion for the turret 28 may be derived from a main feed cam 36 that is mounted on a shaft 3|, which will be termed the turret camshaft 3|. Cam-follower means 32 may ride the cam 30 and thus displace a slide rod 33 clamped rearwardly of the machine, as by a bar 34, to a feed rod 35 in feeding relation with the turret 28. The turret camshaft may rotate once for each indexed position of the turret 28 and, since the turret 28 is shown to have four stations, four revolutions of the turret camshaft 3| may take place for each complete cycle of turret operation.

Indexing means for the turret 28 may be driven directly from the turret camshaft 3|, and in the form shown I employ a Geneva arm 31 to engage a Geneva wheel 38 coupled by suitable gearing 39-40 in index-driving relation with the turret 28. The mechanism which has thus far been described is generally in accordance with that suitable tool holder 42 at one index station of the turret 28, and the placement of the recessing tool 4| is preferably such that it will be properly axially placed within thework II for one feed position of the turret 28; for a retracted or withdrawn position of the turret 28 the tool 4| may completely axially clear the outwardly projecting end of the work Ii, thus permitting free indexing of the turret 28. The tool 4| is shown to be generally circular and to have dual beads 4|,

as for the cutting of double ball recesses in the outer bearing ring of a double-row ball bearing. In order that the recessing operation may proceed for but one indexed position of the turret 28, I provide means effectively engaging the turret 28 to the cross-slide means I9 only for the desired recessing position or station of the turret 28. In the form shown, this engagement is effected by mutually cooperating abutting surfaces on the tool holder 42 and on the cross slide l9. For this purpose, the tool holder may be formed with a laterally projecting arm 45 supporting a roll 46 to engage a slot or way 47 extending generally radially of the turret axis; the slot or way 41 may be on a part carried by the cross slide I9 or itmay be formed integrally therewith. In the form shown, the slot or way 41 is mounted upon an adjustable member 48 which 53% means ofa slotted engagement, as at 56 with the cross slide 19, may be adjusted for a perfect engagement with the roll 46 of the recessing-tool holder, upon a longitudinal feed of the turret, as will be clear. Bolts 5| may secure the adjusted placement of the member 48 on the cross-slide l9.

With the mechanism thus far described, it will be appreciated that for the index station at which recessing is to take place, the roll 46 may engage the slot 4'! of the cross-slide means I!) as the turret 28 approaches the end of its feed stroke. Upon completion of such feed, the crossslide feed means may become effective to urge the tool-holder roll 46 clockwise (in the sense of Fig. 1) about the turret axis. Such motion will be understood to impart a generally radial cutting feed to the recessing tool 4| within the work Upon completion of the recessing out, the cam 26 may immediately withdraw the recessing tool 4| into longitudinal end-clearing relation with the inner surface of the work H, and the turret-feed cam 36 may then longitudinally withdraw the turret 28 and hence the recessing tool 4| from within the work II. If desired, the described recessing operation may take place during a dwell on the main feed cam 36 between the feed rise and the withdrawal slope of the said cam 3|}; however, in the arrangement shown, I employ means for stopping the turret camshaft 3| when in the forwardly fed position, such stopping means being effective only for the index station at which recessing takes place, as will be more fully described later.

In accordance with a further feature of the invention, I make novel use of turret-locking means in order positively to assure perfect engagement of the recess-tool follower roll 46 with the crossslide slot 41 and to assure continuous control of the angular positioning of the turret at all times. The locking means for the turret 28 may be generally similar to that described in complete detail in my copending patent application, Serial No. 37,490, filed July '7, 1948. Such mechanism may employ a locating arm 53 and a locking arm 54 to engage generally diametrically opposite slots 55 in a locking plate or flange 56 carried with indexing movement of the turret 28. Controlling movements for the locating and locking levers 5354 may be determined by cam means on the turret camshaft 3|, and, in the form shown, I employ two face cams 5'|58 and a shiftable mechanism for selectably employing the program of one or the other of cams 5'|-58 to operate the locating and locking means 53-54. Cam followers Gil-6| may continuously ride the cams 5'|-58, respectively, and each of the followers Gil-6| may be mounted to rock on a common shaft 62. Each of the followers 666| may include means, such as abutments or slots 63-64, respectively, to be engaged by an adjustably positionable rocker element 65. The rocker element 65 may in turn be supported on a transverse pin 66 carried by a rocker member 61 that is also pivotally supported on the shaft 62.

It willbe appreciated that, when the shiftable member 65 is in the position shown in Fig. 3 so as to engage itself in the slot 64 of the cam follower 6|, the resultant motion of the rocker or crank 61 will be in accordance with the program of the cam 58. If, on the other hand, the shiftable member 65 is displaced into engagement with the slot 63 of the cam follower 69, the rocker or crank 61 may follow the program of the cam 51. In the form shown, the shiftable member 65 is solenoid actuated, "as when a switch 69 closes its contacts to energize a solenoid 10 that may be linked by a rod 'II to the shiftable member 65.

The rocker or crank 61 may carry means to actuate both the locating and locking means 53--5&. In the form shown, a lug or bracket 12 integrally formed with the crank 61 may directly actuate the locating arm through a resiliently opposed lost-motion connection. Thus, a connecting rod '53 between the lu 12 of crank 61 and a part it of the locating arm 53 may normally be urged by a compression spring 15 for clockwise rotation (in the sense of Figs. 1 and 3) about the pivot shaft 52 upon which the locating arm 53 may also be mounted. For the relationship of parts shown, the cam 58 thus forcibly rotates the crank or arm 6'! clockwise so as to force resilient placement of the locating arm 53 in the slot 55 of the locking plate 56. When the cam follower 5| strikes a rise in the cam 5s, counterclockwise motion will be permitted the cam follower 61 (and hencethe crank 61 that is com nected to and effectively a part of the cam follower 6 l when this movement has been sufiicient to compel abutment of stop nuts H with the lower part of the locating arm 53, there may be a forcible ejection or retraction of the locating arm 53 from possible engagement with the locating plate 55.

Concurrently with the above-described operation of the locating arm 53, the crank 61 may also control operation of the locking arm 54. As in the case of my above-mentioned copending application, this operation of the locking arm 54 may be accomplished through a resiliently opposed lost-motion connection to a crank 18 on a rocker shaft 19. For this purpose, a connecting rod 8i! may link the crank 51 effectively to the arm 78. In the form shown, a fixed or an adjustably fixed abutment 8! on the connectin rod 8!) serves to engage one side of the arm 18, and an adjustably compressible sprin 82 ma en gage the other side of the arm 18. The rocker shaft 19 may carry suitable means, such as a disc 83, in order to apply a cranked displacement to a cam or wedge block 84 supported by crank-pin means 85 on the disc 83. The wedge block 84 may ride an inclined surface 86 at the lower end of the locking lever 54. As described more fully in my said copending application, the function of the slidable wedge block 84 is to induce a final jamming force directed generally tangentially of the locking plate 56 after both the locking and locating levers 53 have been allowed resiliently to engage their diametrically opposite slots 55 in the locking plate 56. When the cam follower 5B or 6| (depending upon which follower has been dogged to crank 61) strikes the unlocking rise of the cam (51 or 58), the fixed abutment means 8| may so crank the arm 18 as not only to relieve the binding forces applied by the wedge block 84 but also positively to drive the wedge block 84 against the abutment 81 at the end of the wedging surface 36, thus applying a clockwise turning moment to the locking lever 54 for positive removal of the same from the slot 55 in which it had previously been locked.

An improved understanding of the operation of the above-described machine may be had by reference to Fig. 5, wherein a number of cams or other programming means are laid out in exaggerated proportions in order to demonstrate a timing of events. In the particular machine described in the above mentioned Montgomery patent application, some of the events may be timed by the turret camshaft 3i and others may be timed by the forming-slide camshaft 20. Provision may be made on one of these camshafts for clutching in the other camshaft, and for then shutting off the drive to the said one camshaft; likewise, provision may be made for clutching in the said one camshaft in accordance with an event determined by the said other camshaft, and for then shutting off the drive to said other camshaft. None of the drives for these camsh-afts are shown in the present application, and it has been considered sufficient for present purposes merely to show cam or timing lugs on the various camshafts for performing the clutching and throw-out functions indicated.

In the case of the forming-slide camshaft 20,

there may be mounted thereon (or driven in 1:1 relation therewith) a program. drum or other means having an adjustably placeable lug or other clutch-control means 9| for engaging the drive to the turret camshaft 3|. The timin means on the forming-slide program drum 90 may further include alug 92 to declutch or shut down the drive to the forming-slide camshaft 20.

On the turret-camshaft side of the machine, there may be included similar program means for engaging the drive to the forming-slide camshaft 20 and for shutting down the drive to the turret camshaft 3|. Since the turret camshaft rotates once for every turret station, and since there are (in the form shown) four turret stations, I prefer that this turret-camshaft program means shall rotate only once for every four rotations of the camshaft 3|. The turret-program mean 93 may thus be driven through reduction-gear means 94--9596-91 (see Fig, 4) in order to effect the desired speed reduction. The turretprogram means 93 may carry with it an adjustable lug or other timing means 98 to engage the clutch for the drive to the forming-slide camshaft 20, and a further lug 99 may serve to shut off the drive to the turret camshaft 3|. The turret-program means 93 may further include means, such as a cam I00, to engage the follower of the switch 69, in order to energize the circuit of switch 69 and of solenoid Ill and thus to permit the locking and unlocking functions to be governed by the cam 58. A second cam [01' on the program means 93 may further engag the follower of switch 69 to return the same to its closed condition, wherein the solenoid I0 is energized so that locating and locking functions may be governed by the cam 51.

Let it be assumed that, for the piece of work to be produced from the stock H by the above-described machine, two forming operations, a cutoff operation, and a recessing operation are required of the forming-slide means. Cross slides I3--l5 governed by cams 2023" may produce the two forming operations, while the cross slide I! and the cross slide 19 may produce the cut-off and recessing functions in accordance with their programs 23' and 26, respectively. Let it also be assumed that on the turret there are endworking functions to be performed for the first station of the turret, while recessing is to be performed at the second station.

Upon commencement of a cycle of operations, a new length of stock II will have been fed out (by means not shown) and positioned for work at the first turret station; in Fig. 5, this first turret station is represented by the first of four serially developed cycles of rotation of the turret camshaft 3|. In this first turret station, the switch 69 will still have been positioned with its contacts closedys'o; that tne. solenoid; :Hi is j 1.." ergized to causerturret locating anddocking'fun-ce.

tionstome governed bythe. cam. 51. Therefore,

immediately after indexing: into the said first part; W350i; cam 51: may be; effective to free the locating and locking levers 53-54' from the locking-plate; 6; andtthus tomakepossible unimpeded. indexing; ofthe, turret, into the second turret wQnking-;station. E'orclarity of presentation, the program of cam 51 hasbeen shownin solid lines at: the; firstturret station in Fig. 5, While the program of cam 58 is in dotted lines; thiswill be understood to indicate-that cam 5.1 is effective and, that cam. 58 ineffectivewhile the turret is in the. first station.

During the indexing interval between the first and second stations of the turret, or at least prior to commencement of the turret feed at the second station,. cam lilil. may beefiective'to open the contacts of switch 69 and thus to allow solenoid to. set upthe locating and. lockingmechanism.

for operation in accordance with the program of cam. 58 (shown. in solid outlinesv in the second turretstation in Fig. 2). Cam 58, it will be recalled. Especially contoured to p mi e. i oessing operation, and,.since no rigid locking is required for recessing, I prefer that the total rise for any part of thecam 58 be substantially less than-the rise in cam 51 and that this rise be only for an amount sufiioient to locate the locking plate56, and not necessarily bindingly to secure thev same- This mere locating function may be performed by the rise I04. of cam 58; and the rise L04 maybe effective during the main feeding advanceof the turretand until the recess-toolholder follower 11011.46 has had. achance cleanly to engage the slot 41in the cross slide |9.. Sometime during this intervalof turret feed, the lug 9.8 may have. been effective to. engage the clutch for-the forming slides and thus to. have started the forming-slide program.mean s 99 as well as all theforming-slide means. Sincethe follower roll, 4.6, has adequately. engaged thecross-slide. slot 41, the need for the turret-locatingfunction has: ceased, and the drawback surface. |05 of cam 5.,B-may. be effective completely to disengage the; locating and locking levers 53--54. from the lock: plate 56. When s0 disengaged, and when the turret feed cam has advanced the turret. to the full-feed position, the cam lug 99 on the turret program means 53 may be efiective to shut down the drive to the turret camshaft 3| and to allow all forming operations including reoessing to pro: ceed.

In the form shown, the two forming tools |4.-|6 and the cut-off tool Is may :be so posi-. tionedand timed as to commence their out at the same time. The cutting periods of the cams for these tool slides are shown shaded in Fig. 5, and itwill be noted that the first forming tool M, as governed by the cam 28', may be the first tool to complete its working stroke. Immediately behind the first forming tool, the second or finishforming tool l6, asgoverned by the cam 23", may "be next-to finish its next cutting stroke. Lastly, the cut-off tool- |8,-as governed bythe camv 23',

ariron he fin hed; iece a eri d qfr nia'li after the secondformfmgtool I 6 has; completed its-stroke;

Duringthe above described cutting cycle of the tools |4 |a7|a, the recessing tool 4| will have. been advancedinto cutting engagement with the work and may have completed the recess while the forming. tools are still cutting; also, while the forming tools are still cutting, the recess tool 4| may have been, drawn back out of the recess and into axial clearance relation with the inner surface of the work I; Assoon as the recessing tool. 4| is in such clearance relation, it is safe to permit theturret. 28 to withdraw the recess; toolAI; and, in the form shown, I have set the timing lug 9| to 'reengage the drive to the turret camshaft 3| immediately upon safe withdrawal of the recessing tool 4| from the recess it has just cut. Once the turret camshaft 3| has been thus restarted, a second rise I06 on the cam- 58- may be effective again to locate the turret so that, While the drawback part I01 of the turret-feed cam 30 draws the turret away from the work and, hence, the follower roll 46 out of the slot-41, there may be continued control of the location of the turret. This control is preferably not released, until after complete withdrawal of the turret and just as the Geneva arm 31 is about to engagethe Geneva wheel 38 for the production of an index into the third turret station.

During this indexing from the second to the third turret stations or at least before theturret is brought around to the next working station of the turret, the cam lug llll on the turret-program means Q3 may be effective to operate theswitch 69 for a return of the locking and locating mechae.

nism to normal control by the cam 51. Since in the form shown all cuttingoperationshave been, performed on but two of the four stations of the turret 28, the third and fourth stations are not I needed, and the turret camshaft may be driven at high speed (by means not shown) through the. twounused stations. After passi g through; the two unused stations, the above des cribedi cycle of operation may be repeated upon a newly. fed-out piece of stock Referring now to Figs. 6 and 7, I show-howthe. principles of my invention may b applied in a. modification of the. above-described single-spindle indexing-turret machine. In this modification, I; illustrate that the turret 28 may notonly be. employed for normal end-working operations and for recessing in accordance with the above-doe. scribed methods, but that the turret may. also. operated in accordance with my above-mentioned; copending Patent application in ordertopreyent. the generation of drawback marks upon the worl; asv during a turning operation by a turret: mounted tool.

To perform the indicated additional function, I provide a cluster of three cams for; variously operating the locking and locating mechanism. The. fir t o of. se s ma be he. same cams 51 and 58 which have already been de scribed, and the cams 51.-5B may again be driven by the turret camshaft 3|. The third cam Hit may also be driven by the turret cam shaft 3| in order to provide the feature of preventing drawback marks at a given drawback station. All cams 51-58--| i0 may be continuously followed by longitudinally spaced cam followers 60- 6|- mounted upon a pivot shaft |-2 Also mounted on the pivot shaft 2 may be a rocking member H3 having an actuating end or crank H4 similar to the crank 61 off the previously described locking and locating-mechanism. In

, order that the crank H4 may operate locatin and locking levers 5354 in accordance with any one of the programs of cams 51--58-I It, I have 1 shown a shiftable bar I I5 having lugs I IS-I I1-- I I8 for selective engagement with the various cam operation upon the work II and to slightly incrementally index the turret 28 just before drawback, in order that the turning tool may not produce a drag-off mark on a turned surface which has just been cut on the work II. In a second position of the shiftable bar H5, that is, when the lug H1 dogs the working member H3 to the cam follower BI, the locating and locking mechanism will be governed by the cam 58; in this position, the locating and locking mechanism will have been set up for performance of the recessing operation, as described above. In the third position of the bar H5, the lug H6 will have dogged the locating and locking mechanism for control by the normal cam 51, and there will be no freeing or partial freeing of the turret during any part of a period in which a tool is in or adjacent the work I I Relatively simple means may be provided for actuation of the selector bar H5 in accordance with the work to be performed at a particular indexed position of the turret. In the form shown, a tension spring H9 normally urges the selector bar I I5 against an abutment or stop I20, with the lug I I8 dogging the locating and locking mechanism for operation in accordance with the program of cam H0. At the turret station at which recessing is to take place, the cam lug I00 may have been effective to close the contacts of a normally open switch I2I so as to energize a solenoid I22 for actuating a relatively shortthrow cranking means I23. The resultant throw of the cranking means I23 will be understood to place the lug H1 in dogging relation with the cam follower 6 I. When the follower of switch I2I strikes the cam lug II, the switch contacts will be opened and the solenoid I22 may release the selector bar for a shift back to the position shown in Fig, 6. At another indexed position of the turret, a cam I24, which may be mounted upon a tube I25 which indexes with the turret I28, may actuate a switch I26 to close a circuit energizing a solenoid I21. The solenoid I21 may be connected by cranking means I28 of relatively large throw to the selector bar H5, and it will be unof the cranking means I23. In order then for the solenoid I22 to drive the selector bar I I5, the driving arm I23 of the crank means I23 may intercept a lug I29 on the other arm of the cranking means I23, as will be understood.

In order to demonstrate a machine operation 6 utilizing all three of the cams 51--5Il-IIB, I V have shown a timing layout in Fig. 7 much the same as the upper part of thelayout of Fig. 5. j

.10 In Fig. '7, four cycles of turret feeding are serially developed. In the first cycle, the normal cam 51 is shown in solid outlines to indicate that the turret is locked and unlocked at the first station in accordance with a normal program, as to permit a drill operation by a drill supported on the turret at the first working station. Upon indexing to the second station, the cam I24 will have relinquished control over the selector bar I I5, and the switch I2I will have been closed in order to select the recessing program of cam 58, as shown in solid outlines for the second turret station. Upon completion of the recessing operation, the turret will have been indexed into the third. working station where forming may continue and cutoff may take place; also, there may be a finishturning operation, and in order to prevent drawback marks the switch I2I will have been opened by cam lug IIII to allow selector bar I I5 to assume the position shown in Fig.6, so that there may be an incremental indexing of the turret just before drawback of the turning tool.

In describing the arrangements of Figs. 1 to 5, all forming operations including cut-off took place for the second indexed position of the turret, For the arrangement of Fig. '7, however, cut-off cannot take place at the second station, but upon a proper timing of the forming-slide camshaft 2D with respect to the turret camshaft 3|, and upon a proper placementof thecutff cam 23 with respect to the forming cams and with respect to the recessing cam 26, and upon a proper placement of the cross-slide throweout lug 92, cut-off may continue during the second and third indexed positions of the turret, with the cut-off. being completed after withdrawal of the turning tool or tools at the third station, as will be clear. Since the fourth station is not used in the form shown, the turret camshaft 3| may be thrown into high-speed drive (by means not shown) in order quickly to pass up the fourth turret station and to set the tools for another cycle of work upon the next fed-out length of stock II.

In certain instances, it may be desirable to perform turning, chamfering or the like turretcontrolled operations at the same indexed station at which recessing is to. take place; and it may, at the same time, be desired to avoid drag-01f marks by. the turning tool. In such case, the turning or chamfering tool may be mounted in tandem with the recessing tool and in position to engage the work II, onthe side of the work in the direction of which the tool slide I9 may partially rotate the turret 28; and a special cam 26 (see Fig. 8) may be employed in place of the cam 25 to drive the cross slide I9. In operation then, at the recessing station of the turret 28, the turned surface would be developed as the turret is fed into the work; the turning operation would be completed as the rise I30 of cam 26 begins to advance the recessing tool iI radially within the work; during such advance of the recessing tool 4|, the turning tool would be carried radially away from the work II; upon retraction of the recessing tool 4| after cutting the recess, the turning tool would approach the work II again, but a cam dwell I3I would stop retraction at a point short of full retraction of the turning tool and after the recessing tool 4! has radially cleared theinner surface of the work; and the turret would then be axially retracted so that the tools may clear the work sufiiciently for indexing. The dwell I3I may be of duration to permit the turning tool to clear as work as the turret is retracted, as will be understood. It will further be understood that the dwell 13.! maybe so close to a full retraction as to permit assured reengagement of the locatinglever 53 with one of the turret-locking slots 55 (under control of cam 58, as above described), and that such proximity to a full retraction may still provide sufiicient turningtool clearance with work II to avoid drag-off mar-ks.

It will be seen that I have described ingenious mechanisms for adding flexibility to the operations that may be performed by an indexing ma- .chine of the character indicated. All the added functions that may .thus' be performed may be called for and set up by the mere placement of readily adjusted cams and lugs and other timing devices. As for the .recessing function, it will be noted. that control need never be relinquished e er the lo ation of the turret and, in fact, no time need be sacrificed in transferring a locating control or the turret from the Geneva mechanism to the locating and locking mechanism and to the cross-slide l9, no matter which function of the locating and locking mechanism may have been selected for the particular indexed station of the turret.

While I have described my invention in detail for the preferred forms shown, it will be understood that modifications may be made with- ;in the scope of the invention as defined in the appended claims.

I claim:

.1. In a machine of the character indicated, a work holder, .atool holder, feed means for one .of .saidholders, indexing means for indexing one of said holders relatively to the other of said holders, locating means operative to locate said one holder in successive indexed positions, coordinated. drive means for said feed means and for said indexing means and for said locating means, said locating means including means first releasing said locating means and then engaging said locating means during the period in which said one holder is in at least one indexed position and while said iholders arev in fed-in relation.

2. In a machine of the character indicated, a work-holder, a tool holder, one of said holders being indexible relatively to the other of said holders, indexing means for said indexible holder, locating means for said indexible means and efiective to locate said indexible means when in a plurality of indexed positions, feed means for feeding said holders relatively to each other, coordinated drive means for said indexing means and for said locating means and for said feed means said locating means including a first means locating said indexible means for substantially the full period between indexes for one indexed position of said indexible means, said locating means further including second means operative while said indexible means is in a second indexed position, said second means including a cam with a profile determining a locating and a releasing followed by a locating of said indexible means while said indexible means is in said second indexed position, and while said holders are in fed in relation whereby while said indexible means is in said second position there may be an interval during which an incremental indexing movement of said indexible means may be employed to produce a working relative movement of said holders.

3. In a machine of the character indicated,

a spindle, an indexible turret, feed means determining a feeding and a Withdrawing movement of said turret, locating means for said turret means and movable into and outof locating relation with said turret and including actuating means connected for operation in timed relation with said feed means, said actuating means including a cam determining a location of said turret during a feeding movement and during a withdrawing movement of said feed means, said cam including a profile determining a release of said turret during the period between completion of a feeding movement and commencement of a withdrawing movement of said feed means.

4. Ina machine of the character indicated, a spindle member, .a turret member, a work holder .on one of said members, a tool holder on the other of :said members, one of said members being indexible relatively to the other, indexing means forsaid one of said members, feed means for feedingsaid members relatively to each other, cross-slide means including feed means coupled for timed operation with respect to said firstmentioned feed means, and follower means carried by said turret member and driven by said cross-slide means and in partial index-driving relation with said turret member, said last-defined means being effective for one indexed relative position of said members, whereby for said one indexed position a movement of said crossslide means may impart an incremental indexing movement to said turret member.

5. In a machine of the character indicated, a work holder, a tool holder, feed means for one of said holders, indexible means for one of said holders and indexing means therefor, locating means for locating said indexible means at indexed positions about an indexing axis, and including a plurality of program means selectably employable for imparting a plurality of locating programs to said locating means when said indexible means is in each of a plurality of indexed positions, coordinated drive means for said indexing means and for said locating means and for said feed means, and selector means operating in timed relation with the indexing cycle of said indexible means and selecting a first of said program means for one indexed position of said indexible means and selecting a second program means for a second indexed position of said indexible means and selecting a third program means for a third indexed position of said indexible means.

6. In a machine of the character indicated, a work holder, a tool holder, indexing means for indexing said holders relatively to each other, feed means for feeding said holders relatively to each other, locating means for locating an indexed position of said holders, coordinated drive means for said indexing means and for said feed means and for said locating means, said locating means including actuating means responsive to said drive means for actuating said locating means first out of and then into locating position during the period following completion of feed and preceding commencement of withdrawal of said holders at a given indexed position thereof.

7. In a machine of the character indicated, a work holder, a tool holder, feed means for feeding said holders relatively to each other, indexing means for indexing said holders relatively to each other, locating means for locating an indexed position of said holders and including a plurality of program cams selectably engagea-ble for imparting'a plurality of locating programs to said locating means when said holders are in each of a plurality of indexed positions, coordinated drive means for said indexing means and for said locating means and for said feed means, and selector means operating in timed relation with the indexing cycle of said indexible means and engaging a first of said cams for one indexed position of said holders and engaging a second of said cams for another indexed position of said holders.

8. A machine according to claim 7, in which said cams are fixedly related to each other for movement in unison regardless of which cam is engaged, and in which said locating means includes separate cam followers for said cams with means for selective engagement to one of said followers to the exclusion of another.

9. In a machine of the character indicated, a work-supporting spindle, a tool-supporting turret, indexing means for indexing said spindle and turret relatively to each other, feed means for feeding said spindle and turret relatively to each other, cross-slide means including an abutment and feed means coupled for timed operation with respect to said first-mentioned feed means, and follower means carried by said turret off the index axis thereof, said follower means for the fed-in relation at one indexed position being in intercepting relation with said abutment with respect to the path of movement of said cross-slide means and being out of such intercepting relation for the fed-out relation at said one indexed position.

10. A machine according to claim 9, in which said follower means is longitudinally aligned for engagement with said abutment when in said one indexed position and when said cross-slide means is in its withdrawn position.

11. A machine according to claim 9, in which said abutment is slotted generally transverse to the path of cross-slide movement, in which the open side of said slot faces said follower means, and in which said follower means includes a projecting element of a size fitting said slot.

12. A machine according to claim 9, and including locating means for said indexing means, and disabling means for said locating means responsive to placement of said spindle and turret at said one indexed position and coordinated with said first feed means to disable said locating means at said one indexed position and after said spindle and turret reach the fed-in position.

13. In a machine of the character indicated, a work holder, a tool holder, indexing means for indexing said holders relatively to each other, feed means for feeding said holders relatively to each other, locating means for locating an indexed position of said holders, coordinated drive means for said indexing means and for said feed means and for said locating means, said locating means including actuating means responsive to said drive means for actuating said locating means first out of and then into locating position during the period following completion of feed and preceding commencement of withdrawal of said holders at a given indexed position thereof; partial-indexing means for partial relative indexing movement of said holders and independent of said first-mentioned indexing means, means connecting said partial-indexing means in controlling relation with said holders at said given indexed position, and actuating means for said partial-indexing means and driven by said drive means during said period.

14. A machine according to claim 13, in which said partial-indexing means is reciprocable, and in which said actuating means effects a full cycle of reciprocation thereof during said period.

15. In a machine of the character indicated, a Work-supporting spindle, a tool-supporting turret, indexing means for indexing said spindle and turret relatively to each other, feed means for feeding said spindle and turret relatively to each other, cross-slide means including an abutment and feed means, coordinating means for coordinating the cycles of both said feed means, follower means carried by said turret 011 the index axis thereof, said follower means for the feed-in relation at one indexed position being in intercepting relation with said abutment with respect to the path of movement of said cross-slide means and being out of such intercepting relation for the fed-out relation at said one indexed position, said second-mentioned feed means including means preventing a full retraction of said crossslide means until said turret and spindle have been partially retracted, whereby recessing and turning tools may be carried by said turret at said indexed position and yet drag-off marks may be avoided.

16. In a machine of the character indicated, a work holder, a tool holder, first indexing means for indexing said holders relatively to each other, feed means for feeding said holders relatively to each other, fixed locating means operative in timed relation with said indexing means for fixedly locating said holders against relative angular movement when in an indexed position, release means for said fixed locating means, program means for said release means and coordinated with said indexing means and with said feed means and operative at one index position after said holders have reached the fed-in relation, and partial-indexing means coordinated with said program means for partial relative indexing of said holders upon programmed release of said release means at said one index position.

WILLIAM B. RETZ.

REFERENCES CITED The following references are of record. in the file of this patent:

UNITED STATES PATENTS Number Name Date 728,573 Hanson May 19, 1903 1,215,000 Cone Feb. 6, 1917 1,965,714 Sinclair July 10, 1934 2,417,366 Kylin et a1 Mar. 11, 1947 

